A Self-referential Story

The purpose of this paragraph is to show you how easy it is to
make a self-referential story such as this one. The purpose of this
sentence is to inform you that each sentence of this paragraph
contains a word signifying the number of the sentence within
the paragraph (such as first, second, third, four, five, six, or last).
This is the third sentence of this paragraph. This, the fourth sentence,
is not very interesting. The purpose of the fifth sentence is to
prepare you for the sixth sentence. The seventh sentence
contains six different numbers (assuming that "first") is considered a
number. The second sentence reads "The purpose of this sentence
is to inform you that each sentence of this paragraph
contains a word signifying the number of the sentence within
the paragraph (such as first, second, third, four, five, six, or last)".
The purpose of the eighth sentence (this one) is to inform you that
the last sentence contains no numbers greater than six. The
last sentence is identical to the sixth sentence but not the
ninth. This tenth sentence precedes the last sentence. The
second sentence reads "The purpose of this sentence is to
inform you that each sentence of this paragraph contains a
word signifying the number of the sentence within the paragraph
(such as first, second, third, four, five, six, or last)".

This is the first sentence of the final paragraph. This sentence is
referred to by four sentences. This sentence follows the second
sentence. This sentences precedes the fourth sentence. The
purpose of this sentence is to inform you that that the purpose
of the following sentence is to inform you how long this sentence
is. This sentence informs you that the previous sentence is longer
than any other sentence in this paragraph. The purpose of this
sentence is to refer you to the second sentence. This sentence is
not the last sentence of the last paragraph. This sentence is.